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| Section | Weight | Objectives |
|---|---|---|
| Troubleshooting | 25% | - System and network troubleshooting
|
| System Management | 30% | - Linux installation, configuration, and system management
|
| Scripting, Containers & Automation | 20% | - Automation and scripting
|
| Security | 25% | - System security and access control
|
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NEW QUESTION # 206
A Linux administrator observes low network throughput. The administrator gathers the following output:
$ ip link show eth0
eth0: < BROADCAST,MULTICAST,UP,RUNNING > mtu 9000 ...
$ ping -s 1472 -M do 192.168.10.2
PING 192.168.10.2(192.168.10.2) 1472(1500) bytes of data.
From 10.10.9.72 icmp_seq=1 frag needed and DF set
Which of the following is the cause of the low network throughput?
Answer: A
Explanation:
Network throughput issues are often caused by Maximum Transmission Unit (MTU) mismatches. MTU defines the largest packet size (in bytes) that can be sent over a network interface. According to CompTIA Linux+ V8 networking objectives, a standard Ethernet MTU is 1500 bytes. Larger values, such as 9000, are known as " Jumbo Frames " and must be supported by every device in the network path (switches, routers, and the destination host).
In this scenario, the output of ip link show eth0 reveals that the local interface is configured for an MTU of
9000. However, when the administrator runs a ping test with a payload of 1472 bytes (which, with headers, equals a 1500-byte packet) and the " Don ' t Fragment " (-M do) flag, the system returns an error: " frag needed and DF set " .
This error message indicates that a device somewhere in the network path has a smaller MTU (likely the standard 1500) and cannot handle the 9000-byte packets the server wants to send. Since the " Don ' t Fragment " bit is set, the device cannot break the packet down and instead drops it. This results in packet loss, retransmissions, and significantly lower throughput as the protocol tries to adapt.
Options A, B, and C are not supported by the provided evidence. A duplex mismatch (Option C) would typically show collisions or CRC errors in ifconfig or ip -s link. Driver or hardware issues would manifest as interface flaps or total connectivity loss. The explicit " frag needed " message is a definitive indicator of an MTU mismatch.
The resolution would be to either ensure Jumbo Frames are enabled throughout the network or lower the local MTU to 1500.
NEW QUESTION # 207
System users are being randomly disconnected from a server. The systems administrator inspects the following output:
# ping 192.168.1.1
--- 192.168.1.1 ping statistics ---
100 packets transmitted, 4 received, 96% packet loss
# ip -s link show
RX: errors 400000
TX: errors 150000
# ip route
default via 192.168.1.1 dev enp0s25 proto dhcp src 192.168.1.102 metric 600 Which of the following should the administrator do to fix the issue?
Answer: A
Explanation:
The correct answer is B. Replace the NIC because the output clearly indicates a hardware-level network issue, specifically with the network interface card (NIC). The ping results show 96% packet loss, which is extremely high and suggests severe communication failure between the system and the gateway. While packet loss can be caused by various issues, the key evidence comes from the ip -s link show output.
The interface statistics show a very large number of RX (receive) and TX (transmit) errors, which are abnormal and indicate that packets are being corrupted or dropped at the hardware or driver level. In a properly functioning interface, error counts should remain very low or zero. Such high error rates strongly suggest a failing NIC, faulty cable, or physical connection issue. Among the provided options, replacing the NIC is the most direct and appropriate solution.
Option A (Assign a proper gateway) is incorrect because the routing table already shows a valid default gateway (192.168.1.1). The system is able to send packets, but they are being lost due to errors, not misrouting. Option C (Increase the ping ' s TTL) is incorrect because TTL affects how long packets can traverse networks, not packet loss due to hardware errors. Option D (Increase the MTU size) is also incorrect because MTU mismatches typically cause fragmentation issues, not massive RX/TX errors.
In Linux troubleshooting, analyzing interface statistics using ip -s link is a critical skill. High error counters are a strong indicator of physical or hardware faults. Therefore, replacing the NIC (or checking cables and hardware) is the correct action to restore reliable network connectivity.
NEW QUESTION # 208
An administrator thinks that the user Joe may be running an unauthorized process on a Linux server. Which of the following commands should the administrator run to confirm this idea?
Answer: A
Explanation:
top -u Joe filters the process display to only show processes owned by user Joe, allowing the administrator to see if Joe is running any unauthorized processes.
NEW QUESTION # 209
A Linux user runs the following command:
nohup ping comptia.com &
Which of the following commands should the user execute to attach the process to the current terminal?
Answer: A
Explanation:
In Linux system management, controlling processes and job execution is a fundamental skill covered extensively in the CompTIA Linux+ V8 objectives. The command shown combines two important concepts:
nohup and background execution using &.
The nohup command is used to run a process immune to hangup signals, meaning the process continues running even after the user logs out or the terminal session ends. By default, nohup detaches the process from the controlling terminal and redirects standard output and standard error to a file named nohup.out. When the ampersand (&) is appended, the process is immediately placed into the background, allowing the shell prompt to return without waiting for the command to finish.
Linux provides job control mechanisms that allow users to manage background and foreground processes within a shell session. The fg command is specifically designed to bring a background job into the foreground and reattach it to the current terminal. Once a job is in the foreground, it can receive input from the terminal and display output directly, and it can also be interrupted using signals such as Ctrl+C.
The other answer choices do not fulfill this requirement. The renice command is used to change the scheduling priority of a running process but does not affect terminal attachment. The jobs command only lists background and stopped jobs associated with the current shell and does not modify their execution state. The exec command replaces the current shell process with a new process, which is unrelated to resuming or attaching background jobs.
According to Linux+ V8 documentation and job control best practices, the correct command to attach a background process to the current terminal is fg. Therefore, option D is the correct answer.
NEW QUESTION # 210
Which of the following best describes journald?
Answer: B
Explanation:
journald is part of systemd and is responsible for collecting, storing, and managing log data from various sources such as the kernel, services, and applications.
NEW QUESTION # 211
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